I view deer processing like any other business. In order for a business to operate it must be profitable (unless it's a government backed chairity).
Costs of doing business varies with costs of labor, tools, Insurance,rent,etc.
I believe in most businesses costs or consumer vary with the quality of the product sold/produced. Based on my own experiences processing deer, the prices I see charged are reasonable for the service. I see no way anyone can make much profit being a deer processor.
I do my own deer processing because I see no way a commercial processor can do the job as clean and thorough as I want it done for the price they charge.